It focuses on high-repetition practice. If you finish a chapter, you don't just "know" the concept; you have the muscle memory to solve it. The "Final Boss" of Calculus:
Week 8 — Synthesis & proofs
is differentiable at $x=0$ and find $f'(0)$. demidovich calculus
You lose the fear of long, multi-step calculations. It focuses on high-repetition practice